As the number of personnel at the Da Zhangshu base increased, Li Yu actually understood that the assessment method set up was very troublesome and relatively inefficient.

However, Li Yu felt very firmly that this must be done.

If once it is released, those people will be allowed to enter the outer city without passing the test.

If you can't guarantee loyalty even to your companions who live under your nose, that actually makes people feel even more worried and scared.

It would be better to have fewer people than to be on tenterhooks all the time. Li Yu never thought about saving the world anyway.

As long as he has enough ability to protect himself and will not be targeted and killed in this apocalyptic world, he thinks that is enough.

.......

In a short period of time, Li Yu finished thinking about this in his mind.

Then he said to his second uncle: "I have an idea. In exactly two days, we will return to the oil city, so let Zuo Ruxue and the others go there together."

"Ah? Let them pass? What's the purpose?" The second uncle frowned and asked.

Li Yu patiently told his second uncle about the situation in the Oil City Walled City.

After all, I was short of time yesterday, so I just gave a general overview. My second uncle didn't know the specific situation of Oil City Walled City.

After Li Yu discussed his considerations with his second uncle.

The second uncle's eyes were shining, and he nodded and said: "This method is not bad. The Oil City Walled City is relatively short of manpower, but it is of great significance.

Compared with those people in the former oil city, Zuo Ruxue and the others are obviously more trustworthy. I think this method is very good, so I will do it."

Hearing the second uncle's affirmation, Li Yu smiled, and then said: "Okay, then second uncle, you can talk to Zuo Ruxue and the others and ask them to prepare in the next two days and leave in two days.

Remember to ask them not to bring too many things."

The second uncle closed the notebook, nodded and said, "I know."

Li Yu hummed and was about to leave.

The second uncle suddenly stopped Li Yu, hesitant and hesitated to speak.

After thinking for a while, he seemed to have made up his mind and asked: "Xiaoyu, I see that you have asked He Chao and Ding Jiu to reinforce some parts of the base in the past two days. Do you think anything will happen?"

In fact, this is not the first time that Li Yu has done this.

From the previous problems such as high temperature, cold, volcanic eruptions, etc., Li Yu seemed to be able to predict the situation and prepare the base in advance.

This allowed the base to avoid losses again and again.

Even before the zombie outbreak, Li Yu had already started preparing to build this base.

This has to make people think deeply about why Li Yu could know.

However, so far no one has asked Li Yu, and no one dares to ask Li Yu this question.

The core personnel in the base are either Li Yu's relatives or survivors who were rescued by Li Yu. They are extremely loyal to Li Yu, so if Li Yu doesn't want to talk, they can't ask.

What's more, people have a very strong ability to make up for themselves.

In the eyes of some people, they may think that Li Yu has the ability to predict the future. After all, zombies have appeared, so it is reasonable for humans to have a prophet.

When the second uncle asked Li Yu, he only asked why he did this, but there was no basis for doing so.

That's because in the past two or three years, Li Yu has proven himself by making correct decisions time and time again.

People have inertia. Once the same result occurs many times, they will naturally form a fixed cognition.

Li Yu turned around and glanced at his second uncle in surprise. He actually didn't do many things, and they were relatively routine. He didn't expect his second uncle to be so sensitive.

After pondering for a while, Li Yu said: "It's just that some natural disasters have always happened in the past two years, but now they haven't happened for several months. I always feel a little uneasy in my heart, and I want to make some preparations. I happened to see some problems, so I

Let He Chao do it."

This explanation is quite reasonable.

The second uncle nodded and said: "Don't tell me that I haven't felt it yet. It is indeed the case. You are right. If this is the case, then when the third outer city is built, I will ask them to strengthen the base.

"

After Li Yu heard this, he thought it would be okay to do this. Anyway, it was just about checking for deficiencies.

So he said: "Okay."

The second uncle looked at the residential building in the second outer city and suddenly said: "Actually, I don't think it's a problem to always put the zombie generator and zombies in that residential building. I always think it would be better to put them underground. You

What do you think?"

Li Yu said with a smile: "I think so too, but it will take time to build the underground fortress. Let's wait until the third outer city is built later."

The second uncle did not speak. When Li Yu saw that the second uncle had nothing to say, he said hello to the second uncle and left.

In fact, the Da Zhangshu base is already relatively stable against the typhoon that is coming soon.

Not to mention anything else, the buildings inside and outside, whether it is the walls or the foundations of residential buildings, are built so deep that they cannot be moved by typhoons.

Even the greenhouse faced the threat of violent storms when it was first built, so it was built very solidly.

However, be careful when sailing.

We don’t know how much damage the typhoon will cause if it passes through.

All Li Yu can do is to do his best to prepare.

........

Since the establishment of a military radio station, Dazhangshu Base communicates with the Oil City Walled City every day.

After discussions between Li Yu and his second uncle, the second uncle notified Zuo Ruxue and the others to get ready, and at the same time informed the third uncle of the news, who was thousands of miles away.

After the third uncle heard the news, he also applauded.

The second uncle also told the third uncle about Li Yu's concerns about natural disasters. The third uncle also felt that Li Yu's worries were quite reasonable, so he also asked Ju Tianrui and others to repair the walls in the oil city and conduct inspections inside.

Some buildings are being reinforced.

After Li Yu explained a series of things, he came to the scientific research room.

The scientific research office was located in the Wengcheng between the second outer city and the inner city. As the number of personnel increased, the scientific research office also expanded.

This chapter is not over yet, please click on the next page to continue reading! Several more people have been added to it.

For example, the students who saved Teacher Liu are now adults, helping here and learning some knowledge.

Pushing open the door of the scientific research institute, Li Yu strode in.

After everyone saw him, they paused slightly and called Mr. Li. Li Yu told them to continue working and not worry about him.

Bai Jie came over and was about to speak.

Li Yu asked first: "How is the progress of aviation kerosene?"

Bai Jie glanced at him resentfully, but when she heard Li Yu ask, she walked in front of him and said, "Teacher Kong Shuang and the others are working on it, but not here. I will take you there."

Li Yu followed behind.

Walked through a door and came to a wider place.

What came into view was a huge vessel filled with black oil.

It seems that this should be the refining equipment.

Li Yu couldn't understand these devices, but he could get under the container, which seemed to be burning, so the whole space was a little stuffy.

"Teacher Kong Shuang, Mr. Li is here." Bai Jie shouted towards Kong Shuang who was busy.

After this period of contact, Bai Jie was impressed by Kong Shuang's knowledge, so she respectfully called her Teacher Kong.

After Kong Shuang heard Bai Jie's voice, she turned her head in surprise.

Then he said: "Director Bai, you told me not to call me teacher. Mr. Li, you are here too."

Kong Shuang walked over and took off the labor protection gloves in his hands.

Li Yu nodded and asked: "How is the aviation kerosene issue?"

Kong Shuang adjusted her glasses and introduced to Li Yu: "It is still being refined, but don't worry, Mr. Li, we will be able to give you the aviation kerosene you need in two days."

"Do you need me to introduce you to the principle of refining?"

Li Yu refused in his heart, and he didn't understand, but it was hard to refuse the kindness, so he said with interest on his face: "Okay, you say it."

Kong Shuang pointed at the leftmost vessel seriously and said:

"Actually, petroleum must be processed before use to make petroleum products suitable for various uses. The common processing method is fractionation, which uses the principle of different molecular sizes and boiling points to separate hydrogen compounds and then chemically treat them

methods to increase the value of the product.”

Li Yu nodded, indicating that he understood.

Kong Shuang continued:

“So, this machine heats the oil to between 400°C and 500°C, turns it into steam, and then feeds it into the fractionation tower.

Well, that is the fractionating tower. In the fractionating tower, the higher the position, the lower the temperature. The petroleum vapor will gradually liquefy, cool and condense into liquid fractions on the way up.

Gaseous fractions with smaller molecules and lower boiling points slowly rise along the tower and condense at the upper levels of the tower, such as fuel gas, kerosene, etc.
To be continued...